Infiniti I30 (A33). Manual — part 235
9
CHECK HO2S2 (REAR) SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-17.
3. Check the following.
I
Continuity between joint connector terminal 1 and ground
I
Joint connector
(Refer to EL-525, “HARNESS LAYOUT”.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector-17.
OK or NG
OK
©
GO TO 10.
NG
©
Repair open circuit or short to power in harness or connectors.
10
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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DTC P0137 (BANK 1), P0157 (BANK 2) HO2S2 (REAR) (MIN. VOLTAGE
MONITORING)
Diagnostic Procedure (Cont’d)
EC-255
SEF327R
Component Description
NHEC0138
The heated oxygen sensor 2 (rear), after three way catalyst
(Manifold), monitors the oxygen level in the exhaust gas on each
bank.
Even if switching characteristics of the heated oxygen sensor 1
(front) are shifted, the air fuel ratio is controlled to stoichiometric,
by the signal from the heated oxygen sensor 2 (rear).
This sensor is made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions.
Under normal conditions the heated oxygen sensor 2 (rear) is not
used for engine control operation.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0139
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
I
Engine: After warming up
Revving engine from idle up to
2,000 rpm
0 - 0.3V
+,
Approx. 0.6 - 1.0V
HO2S2 MNTR
(B1)
HO2S2 MNTR
(B2)
LEAN
+,
RICH
SEF303U
On Board Diagnosis Logic
NHEC0141
The heated oxygen sensor 2 (rear) has a much longer switching
time between rich and lean than the heated oxygen sensor 1
(front). The oxygen storage capacity before the three way catalyst
(Manifold) causes the longer switching time. To judge the malfunc-
tions of heated oxygen sensor 2 (rear), ECM monitors whether the
maximum voltage of the sensor is sufficiently high during the vari-
ous driving condition such as fuel-cut.
Malfunction is detected when the maximum voltage from the sen-
sor is not reached to the specified voltage.
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Component Description
EC-256
Possible Cause
NHEC0439
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 2 (rear)
I
Fuel pressure
I
Injectors
I
Intake air leaks
SEF663Y
SEF664Y
SEF665Y
DTC Confirmation Procedure
NHEC0142
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Open engine hood before conducting following procedure.
WITH CONSULT-II
NHEC0142S01
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Turn ignition switch “ON”.
4)
Select “DATA MONITOR” mode with CONSULT-II.
5)
Make sure that “COOLAN TEMP/S” indicates more than 70°C
(158°F).
6)
Select “HO2S2 (B1) P0138” or “HO2S2 (B2) P0158” of
“HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-II.
7)
Start engine and follow the instruction of CONSULT-II.
8)
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”.
If NG is displayed, refer to “Diagnostic Procedure”, EC-261.
If “CANNOT BE DIAGNOSED” is displayed, perform the fol-
lowing.
a)
Stop engine and cool down until “COOLAN TEMP/S” indicates
less than 70°C (158°F).
b)
Turn ignition switch “ON”.
c)
Select “DATA MONITOR” mode with CONSULT-II.
d)
Start engine.
e)
Return to step 6 again when the “COOLAN TEMP/S” reaches
to 70°C (158°F).
SEF312XB
Overall Function Check
NHEC0143
Use this procedure to check the overall function of the heated oxy-
gen sensor 2 (rear) circuit. During this check, a 1st trip DTC might
not be confirmed.
WITH GST
NHEC0143S01
1)
Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.
2)
Stop vehicle with engine running.
3)
Set voltmeter probes between ECM terminal 72 [HO2S2 (B1)
signal] or 71 [HO2S2 (B2) signal] and engine ground.
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DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Possible Cause
EC-257
4)
Check the voltage when racing up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.56V at least once during
this procedure.
If the voltage can be confirmed in step 4, step 5 is not
necessary.
5)
Keep vehicle at idling for 10 minutes, then check the voltage.
Or check the voltage when coasting from 80 km/h (50 MPH)
in “D” position with “OD” OFF.
The voltage should be above 0.56V at least once during
this procedure.
6)
If NG, go to “Diagnostic Procedure”, EC-261.
DTC P0138 (BANK 1), P0158 (BANK 2) HO2S2 (REAR) (MAX. VOLTAGE
MONITORING)
Overall Function Check (Cont’d)
EC-258
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